American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 371
, and movable in either direction. Around thedial are metal discs on any one of which an end of h and h may rest. The termi-nals of the resistance coils are brought to these discs, as shown. The external con-nections are made at the binding posts bs, bs. The sum of the resistance coils on the left… … 3l8 AMERICAN TELEGRAPHY. coil EC, on the left of the dial which may be added to the circuit, when required, hyremoving plug p. If, as in the figure, the hand h rests on the 2,000 ohm disc, and the hand h, onthe 120 ohm disc, there will be a total resistance of 2,120 ohms in circuit, as maybe found…
Telegraph
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